A tandem sequence of hydroxylamine-alkyne cyclisation/1,3-dipolar cycloaddition, provides useful entry into tricyclic systems of type 4. The scope of such reactions is explored in this paper. A novel cascade cyclisation of N-hydroxypyrrolidines of type 26 and 28 involving hydroxylamine-alkyne cyclisation, Cope elimination and 1,3-dipolar cycloaddition is also reported.
羟胺-炔环化/ 1,3-偶极环加成的串联序列,为进入4型
三环系统提供了有用的入口。本文探讨了此类反应的范围。还报道了26和28型
N-羟基吡咯烷的新型级联环化,包括
羟胺-炔环化,Cope消除和1,3-偶极环加成。